I am now trying to test some optics in order to find the most comfortable, most adjustable and most compact layout. I have printed a small case to hold the display and prism however I think I will need a new prism or get a smaller display in order to fit the full image. I have a rough idea on what lens I will need so I also need to buy that but for now I am going to try and make do with my current lens and prism. 

This prism is actually two right angle prisms joined together so it forms a cube with a divide in the middle to reflect the image to the eye.